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How to use toExponential method

不言Original: 2019-02-19 16:35:203332browse

The toExponential() method in javaScript is used to convert a number into exponential form. It returns a string representing a Number object in exponential notation. Let's take a closer look at how to use toExponential().

Let’s first take a look at the basic syntax of toExponential()

number .toExponential（value）

The toExponential() function accepts a single parameter value. It is an optional parameter that represents a value that specifies the number of digits after the decimal point.

Let’s look at a specific example

Pass a number as a parameter in the toExponential() method. If a number is passed as a parameter to the toExponential() method, it represents the number of digits after the decimal point.

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script type="text/javascript"> 
    var num = 2.13456; 
    document.write(num.toExponential(2));           
</script> 
</body>
</html>

The output result is: 2.13e 0

No parameters are passed in the toExponential() method

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script type="text/javascript"> 
    var num = 2.13456; 
    document.write(num.toExponential());           
</script> 
</body>
</html>

The output result is: 2.13456e 0

Pass zero as a parameter in the toExponential() method

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script type="text/javascript"> 
    var num = 2.13456; 
    document.write(num.toExponential(0));           
</script> 
</body>
</html>

The output result is: 2e 2

The last thing to note is:

Range error: This exception is thrown when the value parameter passed is too small or too large. Values between 0 and 20, inclusive, do not cause a RangeError. If you want to pass a value larger or smaller than specified by this range, you must implement the toExponential() function accordingly.

Type error: This exception is thrown when the toFixed() method is called on an object that is not a type number.

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JavaScript 字符串 number 对象

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